“It was the type of knee impact that is so sudden and unexpected that, initially, you think you’ve got away with it. ‘Oh, my knee has been in sharp collision with a hard and unyielding object,’ you think. With the slightest of pauses, you further reflect, ‘And, gosh, there doesn’t appear to be any pain. What a happy and pleasing phenomenom.’ This smoothly segues into ‘Arrrrrrghhh!'”